Tool for manufacturing tooth-crowns.



No. 688,440. Patented Dec. l0, |90|.

w. P. SCOTT.

TOOL FOR MANUFACTURINGHTOOTH BROWNS. (Application fil ed Dec. 15, 1900.) (Moileh) i I I l l -l Z f v, a -f Z z a e &

. i V J If I ZJWM/ Qzw ATTORNEY MW,- WZM JZiM UNITED STATES PATENT OFFICE.

WILLIAM P. SCOTT, OF CHICAGO, ILLINOIS.

TOOL FOR MANUFACTURING TOOTH-CROWNS.

SPECIFICATION forming part of Letters Patent No. 688,440, datedDecennber 10, 1901. I Application filed December 15,1900. Serial No. 39,963. (Model-l D. S., a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Tools for Manufacturing Tooth-Crowns, of which the following is a specification.

My invention relates to that class of tools used for the purpose of making seamless toothcrowns, and particularly to the means by which a blank crown is swaged upon and made to partake of the shape of the tooth-pattern, all of which will more fully hereinafter appear.

The principal object of the invention is to provide a simple,ec0nomical, and eflicient tool for manufacturing seamless tooth-crowns;

and the invention consists in the features, combinations, and details of construction hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a full-sized view of a tool constructed in accordance with my improvements; Fig. 2, a vertical sectional elevation of the same, taken through the longitudinal center thereof; Fig. 3, a perspective View of the swaging-plunger; Fig. 4, a perspective view of the soft-metal swaging-blocks; Fig. 5, a perspective view of the drift-pin; Fig. 6, a perspective view of the upper guide; Fig. 7, a perspective view of the mold and swaging-die; Fig. 8, a perspective view of the base-piece; Fig. 9, a perspective view of the completed crown and pattern, and Fig. 10 a perspective view of the blank-cartridge crown.

In the art to which this invention relates it is well known that it has been desirable for a long time to manufacture a seamless toothcrown in such a way and with such economy as to make a merchantable and marketable article. It is also well known that the teeth of different persons vary, practically no two teeth being of the same size and shape throughout, and consequently it has been deemed impracticable to make crowns for each separate tooth at a price which would be within the reach of ordinary individuals.

The principal object of my invention, therefore, is to provide a means and apparatus by which crowns can be-duplicated for the teeth of any person at a price that will place them within the reach of the average individual, all of which will more fully hereinafter appear.

In constructing an apparatus or tool with which to carry out my improvement I take what I term a combined mold and swaging or holding die a, which is preferably cylindrical in contour,'and provide it with a conical bore b, extending axially through the same, in which the soft-metal swages are cast, as hereinafter more fully set forth.

It is desirable to first make a soft-metal base 0, preferably of lead or similar soft substance, resembling a truncated cone, as shown particularly in Fig. 4. To accomplish this result, I place the mold a upon a suitable base (1, in which a plug (not shown) is inserted. I then pour into this mold su fficient melted lead to form the truncated cone 0. It is next desirable to make a second truncated cone in two parts, split longitudinally, which form the swaging portions proper, and to make it of soft metal, as before. In order to make this second or swaging truncated cone e,'I take a small metal rod or mandrel about the diameter of an ordinary lead-pencil and place it axially within the bore of the mold, with its end resting upon the first cone. I then pour within the mold a sufficient quantity of molten lead to form the second truncated cone around the metal mandrel or core, (see'Figs. 2,3, and 4,)with a hole extending therethrough the diameter of the core. I then take this cone-shaped piece of soft metal and split it longitudinally, so that it forms two swaging parts, as shown particularly in Fig. 4. I next provide a guide-block f, adapted to fit the shoulder g on the holding-die, and which has an axial bore h extending therethrough. This guide, as stated hereinafter, is placed upon the holding-die,as shown in Figs. 1 and 2, so that its axial opening is in alinement with the cone-shaped bore of the die. I then take a piece of soft metal 11, which is cut or formed swaging-blocks, all of which are placed within the cone-shaped bore of the holding-die upon which the guide-block f is placed. I then take a plunger k and insert it within the axial opening of the guide, so that its end rests upon the soft swaging-blocks. By striking this plunger with a mallet or hammer the soft swaging-blocks are forced down into the bore of theholding-die, and, closing together, force the cartridge to partake of the configuration of the tooth-pattern. In Fig. 2 it will be seen that the surplus metal due to the displacement of the material in excess of the size of the cartridge and pattern is flowed up around the plunger, as shown at Zin Fig. 2, while the lower part of the crown rests upon the softmetal base a. The crown is now completed, and to remove it from engagement with the tool the guide-block and plunger are first removed. A drift-pin mis next inserted in the bore of the base-block d in contact with the soft base, so that a few strokes thereon of a mallet or hammer forces the soft-metal base and swaging-blocks out of engagement with the holding-die. The pattern being made of soft metal and the crown j of gold, silver, or other desired material is subjected to heat, so as to melt the pattern and permit it to run out of the crown.

From the foregoing description it will be seen that I have provided a simple and eificient means for reproducing any desired crown and that it is substantially as cheap to reproduce a multiplicity of patterns as a multiplicity of pieces of one pattern, all of which will be appreciated by those skilled in the art.

I claim 1. In a tool of the class described, the combination of a holding-die provided with a tapered bore, a metal base at the small end of such bore, and swaging-blocks formed of soft metal resting thereon, substantially as described.

2. In a tool of the class described, the combination of a holding-die having a cone-shaped bore therein, a soft-metal base in such bore at the smaller diameter thereof, and a swaging-block split longitudinally resting thereon, substantially as described.

3. In a tool of the class described, the combination of a holding-die having a cone-shaped bore therein, soft-metal swaging-blocks in such bore, a guide-block on such holding-die provided with an axial opening, and a swag ing-plunger in such bore adapted to contact the soft swaging-blocks, substantially as described.

4. In a tool of the class described, the combination ofaholding-die havinga cone-shaped bore therein, soft-metal swaging-blocks in such bore, a guide-block on such holding-die provided with an axial opening, a swagingplunger in such bore adapted to contact the soft swaging-blocks, and a base-block upon which the holding-die is supported provided with an axial opening through which a driftpin may be inserted, substantially as described.

\VILLIAM P. SCOTT.

Witnesses:

S. MILTON EICHBERG, GUY H. POWELL. 

